Insert socket



FIG. 1 is a top perspective view of an insert socket showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

Broken lines in the drawings depict portions of the insert socket that form no part of the claimed design. 

CLAIM The ornamental design for an insert socket, as shown and described. 